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Ill conditioning loci in noise parameter determination

Ill conditioning loci in noise parameter determination

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An analysis of the problem of noise parameter determination is carried out. It is found that the mathematical problem is ill-posed if all the source reflection coefficients (Γs) used in the measurements fall onto a line, circle or arc of a circle in the Smith chart. This is used to expand on existing criteria for selecting Γs and to rule out sources of accuracy degradation.

Inspec keywords: microwave circuits; two-port networks; circuit noise

Other keywords: ill conditioning loci; source reflection coefficients; Smith chart; linear two-port; noise figure; microwave circuits; accuracy degradation; noise parameter determination

Subjects: Microwave circuits and devices

References

    1. 1)
      • J. Lange . Noise characterisation of linear twoports in terms of invariant noiseparameters. IEEE J. Solid-State Circuits , 2 , 37 - 40
    2. 2)
      • G.W. Stewart . (1973) Introduction to matrix computations.
    3. 3)
      • J.M. O'Callaghan , J.P. Mondal . A vector approach for noise parameter fitting and selection of sourceadmittances. IEEE Trans. Microw. Theory Tech. , 8 , 1376 - 1382
    4. 4)
      • G.I. Vasilescu , G. Alquie , M. Krim . Exact computation of two-port noise parameters. Electron. Lett. , 4 , 292 - 293
    5. 5)
      • G. Caruso , M. Sannino . Computer-aided determination of device noise parameters. IEEE Trans. Microw. Theory Tech. , 9 , 639 - 642
    6. 6)
      • R.Q. Lane . The determination of device noise parameters. Proc. IEEE , 1461 - 1462
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